refactor: error check in show container

Author: ChibangLW

src/AppBundle/Controller/ContainerController.php

@@ -571,11 +571,7 @@ public function showSingleAction(Request $request, int $containerId, ContainerAp
 
             $result = $api->show($container->getHost(), $container->getName());
 
-            if ($error = $this->checkForErrors($result)) {
-                throw new ElementNotFoundException(
-                    'No container found for name: ' . $container->getName()
-                );
-            }
+            $this->checkForErrors($result);
 
             $container->setArchitecture($result->body->metadata->architecture);
             $container->setConfig($result->body->metadata->config);